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Proceedings Paper

Delivery of high-energy radiation in midinfrared spectral region by hollow waveguides
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Paper Abstract

Due to increasing number of requirements dealing with the application of a high energy mid-infrared radiation in various branches of medicine (cardiology, dentistry, dermatology, urology, gastroenterology), an enough flexible and lossless delivery system is required. For a transport of this high energy pulses in a mid-infrared region special cyclic olefin polymer-coated silver (COP/Ag) hollow glass waveguides were prepared and tested. A length of the waveguides was 0.5 m and inner diameter 1 mm. As a radiation source, an Er:YAG laser was used. The system generated the energy up to 2.16 J or 2.35 J (in dependence on a repetition rate used - 3 Hz or 4 Hz, respectively). The length of transmitted pulses was measured to be from 110 up to 550 usec in dependence on output energy used. The output radiation was coupled into the COP/Ag waveguide and a throughput and losses values were measured in dependence to input radiation parameters. The transmission obtained was 91%. The maximum delivered energy was dependent on a damage threshold of the waveguide. It was found that the damage threshold is dependent on the repetition rate which shows the dependences on the heat dissipated in the waveguide wall. The value of the damage was 1.7 J and 1.5 J for 3 Hz and 4 Hz repetition rate, respectively. The safe delivered power reached the value of 5 W. The characteristics obtained make this specially constructed COP/Ag hollow glass waveguide promising for the delivery of high-energy laser pulses in medicine and also in other applications.

Paper Details

Date Published: 1 July 2003
PDF: 5 pages
Proc. SPIE 4957, Optical Fibers and Sensors for Medical Applications III, (1 July 2003); doi: 10.1117/12.478044
Show Author Affiliations
Michal Nemec, Czech Technical Univ. (Czech Republic)
Helena Jelinkova, Czech Technical Univ. (Czech Republic)
Jan Sulc, Czech Technical Univ. (Czech Republic)
Pavel Cerny, Czech Technical Univ. (Czech Republic)
Mitsunobu Miyagi, Tohoku Univ. (Japan)
Katsumasa Iwai, Tohoku Univ. (Japan)
Yukio Abe, Tohoku Univ. (Japan)
Yi-Wei Shi, Tohoku Univ. (Japan)
Yuji Matsuura, Tohoku Univ. (Japan)

Published in SPIE Proceedings Vol. 4957:
Optical Fibers and Sensors for Medical Applications III
Israel Gannot, Editor(s)

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